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DNS flood: Query Flood

DNS servers provide the roadmap to the Internet, and help clients find the servers they are looking for. A DNS query flood uses a network of clients to target a single server with floods of valid requests.

By targeting a single DNS server and flooding it with valid requests, a DNS query flood makes it very difficult for DNS servers to distinguish from normally heavy traffic.

F5 BIG-IP DNS uses DNS Express functionality to mitigate these attacks through the intelligent application of computational power. By scaling linearly across multiple processing cores, DNS Express protects the perimeter by handling all DNS traffic—valid and invalid—as much as an order of magnitude faster than a traditional DNS server.